durand



2 Sheets-Sheet 1. L.. DURAND. Grinding-Mill.

No.'224,66 4. Patented Feb. 17, 1880;

z /en ar @M/Mu 2 Sheets-Sheet 2.

'L. DURAND. Grinding-Mill.

. Patented my. 17, 1880..

Invenfar.

W hzeyy as? *N- PETERS. FHDTD-LITHOGRAFHER WASHINGTON. D. C

UNITED STAT S PATENT OFFICE.

LOUIS DURAND, 0F QUEBEC, PROVINCE OF QUEBEC, OANAD A, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO DEXTER H. WALKER, OF NEW YORK, N. Y.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 224,664, dated February 17, 1880,

Application filed June 5, 1879.

To all whom "it may concern Be it known that 1, Louis DURAND, of Quebee, in the Province of Quebec and Dominion of Canada, have invented a new and Improved Mill, of which the following is a specification.

The object of my invention is to provide a mill in which the material is crushed before coming onto the principal grinding-stones, and, further, to provide an air-space through which the farina has topass during the operation. V The inventionconsists of a mill having a fixed and a revolving stone, and above the latter a crushing apparatus consisting of a small revolving stone fastened to the shaft and a small fixed stone above the small revolving stone, the parts being combined and operating as hereinafter described.

In the drawings, Figure 1 is a front elevation with partof the box broken ofi. Fig. '2 is a vertical section on the line 3 y. Fig. 3 is a plan view with part of the cover of the box broken 01f. Fig. at is a horizontal section on the line 00 on. Fig. 5 is a view of the underside of the small fixed stone.

Similar letters of reference indicate corresponding parts.

The uprights K K and the cross-pieces L L L form theframeof the mill. Wis the top plate, supporting the box 0, which fits into the recess 5.

J J are two uprights, supporting the cross bar D, which is pivoted at cl, and secured at the other end by a pin, 6?. d is a small plate, fastened to the top of D to hold the tube E in position.

A is the funnel, into which the material is poured. The neck of this funnel passes into a tube, E, the lower part of which is widened and threaded. The wheel B provided with the neckb, encircles this tube E. There is a slot or notch in I), which engages with a pin, 6, on the tube E.

. c is the box into which the upper small fixed stone, f, is fastened. The upper part of this box forms a threaded tube, which engages with the threaded part of E. All these parts are supported on the cross-piece D.

His the main shaft, and derives its motion from the shaft S by means of the bevel-cogs It and R, or some similar arrangement. Sand S are a loose and a fast pulley on the shaft S.

A cap, U, is fastened to the upper end of the shaft H and secured by the screw m. This cap widens on top, and forms the box 0 for the lower small revolving stone, g. A balance, T, rests 011 the top of the shaft, passes through the cap U, and supports the large revolving stone F, as is shown in Fig. 2.

G is the large fixed stone, and rests on the cross-pieces L L, and is graduated by means of the screw-pins Q Q, and has acentral opening, through'which the shaft H passes.

h and h is an annular opening in the box 0, and is between the box 0 of the smaller rotating stone 9 and the stone F.

[is a tube, through which the flour flows otf. N. is the bent lever, which supports the lower end of the shaft H; It is raised or lowered by means of the screw P and rod N The small fixed stone f and the large revolving stone F have a central opening, through which the material which is to be ground passes down.

The operation is as follows: The material which is to be ground is poured into the funnel A, passes down through the tube E onto the revolving stone 9. Here it is crushed between the two stones f and g and thrown outward by the centrifugal force, and falls onto the fixed stone Gr. It is then ground between the stones G and F, and then passes down through the tube 1.

The operation can be regulated in the following manner: The notch in the sleeve 1) catches the pin 6 on the outside of the tube E, so that if the hand-wheelB is turned the tube E will turn. with it. As the small plate cl prevents E from moving upward, the box c must necessarily rise or fall as the screw-threads of c and E engage each other. In this way the contact between f and y can be regulated. The contact between F and G can be regulated by means of the lever N, as is seen from the drawings.

The advantages of my mill are the following: The grain is first crushed between the stones f and g, and then falls down into G. In

doing so it has to pass through the air-space I h and h. In passing through this current of air, which is produced in this air-space, the farina is cooled, and does notfall on the stone G in a warm condition. The fault with all other mills was, that the grain and the stones very soon became hot, and the quality of the farina deteriorated.

Another great advantage is, that the grain is crushed between the small stonesf and g, and as this operation is performed on a very small surface it can be done with less power than in any other system of mills.

My system of arranging mills-4. 0., arranging a small. additional crushing apparatus 011 the upper end of the shaft-can be applied to any kind of mill, large or small, and any kind of power can be used to drive the mill.

As the cross-piece D is pivoted at d, it can be very easily raised. The upper part of the. small crushing apparatus is raised with it, and

the stones can be very conveniently examined 20 4 LOUIS DURAND.

Witnesses:

W. DARLING CAMPBELL,

Of Quebec, Notary Public.

JNo. D. BROWN,

Of Quebec, Clerk. 

